{"id":2661,"date":"2023-07-21T07:12:29","date_gmt":"2023-07-21T07:12:29","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e7%9a%84%e5%b8%83%e9%9b%b7%e6%9f%af%e8%92%82%e6%96%af%e5%b7%ae%e5%bc%82\/"},"modified":"2023-07-21T07:12:29","modified_gmt":"2023-07-21T07:12:29","slug":"r-%e4%b8%ad%e7%9a%84%e5%b8%83%e9%9b%b7%e6%9f%af%e8%92%82%e6%96%af%e5%b7%ae%e5%bc%82","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e7%9a%84%e5%b8%83%e9%9b%b7%e6%9f%af%e8%92%82%e6%96%af%e5%b7%ae%e5%bc%82\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u8ba1\u7b97 bray-curtis \u76f8\u5f02\u5ea6"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/cn\/\u5e03\u96f7\u67ef\u8482\u65af\u5dee\u5f02\/\" target=\"_blank\" rel=\"noopener\">Bray-Curtis \u76f8\u5f02\u6027<\/a>\u662f\u8861\u91cf\u4e24\u4e2a\u4e0d\u540c\u7ad9\u70b9\u4e4b\u95f4\u76f8\u5f02\u6027\u7684\u4e00\u79cd\u65b9\u6cd5\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5b83\u7ecf\u5e38\u7528\u4e8e\u751f\u6001\u5b66\u548c\u751f\u7269\u5b66\u4e2d\uff0c\u4ee5\u91cf\u5316\u4e24\u4e2a\u5730\u70b9\u4e4b\u95f4\u53d1\u73b0\u7684\u7269\u79cd\u4e4b\u95f4\u7684\u5dee\u5f02\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u8ba1\u7b97\u65b9\u6cd5\u5982\u4e0b\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>BC <sub>ij<\/sub> = 1 \u2013 (2*C <sub>ij<\/sub> ) \/ (S <sub>i<\/sub> + S <sub>j<\/sub> )<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u91d1\u5b50\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>C <sub>ij<\/sub> \uff1a<\/strong>\u6bcf\u4e2a\u5730\u70b9\u53d1\u73b0\u7684\u7269\u79cd\u6700\u4f4e\u503c\u7684\u603b\u548c\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong><sub>Si<\/sub> :<\/strong>\u5728<em>\u7b2c i \u4e2a<\/em>\u5730\u70b9\u8ba1\u6570\u7684\u6837\u672c\u603b\u6570<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>S <sub>j<\/sub> \uff1a<\/strong>\u5728<em>j<\/em>\u70b9\u8ba1\u6570\u7684\u6837\u672c\u603b\u6570<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">Bray-Curtis \u76f8\u5f02\u5ea6\u59cb\u7ec8\u4ecb\u4e8e 0 \u548c 1 \u4e4b\u95f4\uff0c\u5176\u4e2d\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong>\u8868\u793a\u4e24\u4e2a\u7ad9\u70b9\u6ca1\u6709\u5dee\u5f02\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5b83\u4eec\u6bcf\u79cd\u7269\u79cd\u7684\u6570\u91cf\u5b8c\u5168\u76f8\u540c\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong>\u8868\u793a\u4e24\u4e2a\u7ad9\u70b9\u5b8c\u5168\u4e0d\u540c\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5b83\u4eec\u4e0d\u5171\u4eab\u4efb\u4f55\u540c\u4e00\u7c7b\u578b\u7684\u7269\u79cd\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5047\u8bbe\u4e00\u4f4d\u690d\u7269\u5b66\u5bb6\u51fa\u53bb\u8ba1\u7b97\u4e24\u4e2a\u4e0d\u540c\u5730\u70b9\u7684\u4e94\u79cd\u4e0d\u540c\u690d\u7269\u7269\u79cd\uff08A\u3001B\u3001C\u3001D \u548c E\uff09\u7684\u6570\u91cf\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4e0b\u8868\u603b\u7ed3\u4e86\u5979\u6536\u96c6\u7684\u6570\u636e\uff1a<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-15115 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/bray_curtis.png\" alt=\"\" width=\"423\" height=\"121\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u4f7f\u7528\u8fd9\u4e9b\u6570\u636e\uff0c\u5979\u53ef\u4ee5\u8ba1\u7b97 Bray-Curtis \u76f8\u5f02\u5ea6\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-15116 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/bray_curtis2.png\" alt=\"\u5e03\u96f7-\u67ef\u8482\u65af\u5dee\u5f02\" width=\"419\" height=\"226\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u901a\u8fc7\u5c06\u8fd9\u4e9b\u6570\u5b57\u79ef\u5206\u5230 Bray-Curtis \u76f8\u5f02\u5ea6\u516c\u5f0f\u4e2d\uff0c\u6211\u4eec\u5f97\u5230\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">BC <sub>ij<\/sub> = 1 \u2013 (2*C <sub>ij<\/sub> ) \/ (S <sub>i<\/sub> + S <sub>j<\/sub> )<\/span><\/li>\n<li> <span style=\"color: #000000;\">BC <sub>ij<\/sub> = 1 \u2013 (2*15) \/ (21 + 24)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><sub>BCij<\/sub> = 0.33<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u8fd9\u4e24\u4e2a\u4f4d\u70b9\u4e4b\u95f4\u7684 Bray-Curtis \u5dee\u5f02\u4e3a<strong>0.33<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u793a\u4f8b\u663e\u793a\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97 Bray-Curtis \u76f8\u5f02\u6027\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u793a\u4f8b\uff1a\u8ba1\u7b97 R \u4e2d\u7684 Bray-Curtis \u76f8\u5f02\u5ea6<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u5728 R \u4e2d\u521b\u5efa\u4ee5\u4e0b\u6570\u636e\u6846\u6765\u4fdd\u5b58\u6570\u636e\u503c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (A=c(4, 3),\n                 B=c(0, 6),\n                 C=c(2, 0),\n                 D=c(7, 4),\n                 E=c(8, 11))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  A B C D E\n1 4 0 2 7 8\n2 3 6 0 4 11<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6765\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u4e24\u884c\u4e4b\u95f4\u7684 Bray-Curtis \u76f8\u5f02\u5ea6\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate Bray\u2013Curtis dissimilarity\n<\/span>sum( <span style=\"color: #3366ff;\">apply<\/span> (df, 2, <span style=\"color: #3366ff;\">function<\/span> (x) <span style=\"color: #3366ff;\">abs<\/span> ( <span style=\"color: #3366ff;\">max<\/span> (x)- <span style=\"color: #3366ff;\">min<\/span> (x)))) \/ <span style=\"color: #3366ff;\">sum<\/span> ( <span style=\"color: #3366ff;\">rowSums<\/span> (df))\n\n[1] 0.3333333\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Bray-Curtis \u7ed3\u679c\u662f\u4e0d\u540c\u7684<strong>0.33<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u8fd9\u4e0e\u6211\u4eec\u4e4b\u524d\u624b\u52a8\u8ba1\u7b97\u7684\u503c\u76f8\u7b26\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6ce8\u610f<\/strong>\uff1a\u4ec5\u5f53\u6570\u636e\u6846\u4e2d\u7684\u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u4e2a\u5355\u72ec\u7684\u7ad9\u70b9\u65f6\uff0c\u6b64\u516c\u5f0f\u624d\u6709\u6548\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97\u5176\u4ed6\u76f8\u4f3c\u6027\u5ea6\u91cf\uff1a<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684\u6770\u5361\u5fb7\u76f8\u4f3c\u5ea6\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728R\u4e2d\u8ba1\u7b97Jaccard\u76f8\u4f3c\u5ea6<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u4f59\u5f26\u76f8\u4f3c\u5ea6-r\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u8ba1\u7b97R\u4e2d\u7684\u4f59\u5f26\u76f8\u4f3c\u5ea6<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bray-Curtis \u76f8\u5f02\u6027\u662f\u8861\u91cf\u4e24\u4e2a\u4e0d\u540c\u7ad9\u70b9\u4e4b\u95f4\u76f8\u5f02\u6027\u7684\u4e00\u79cd\u65b9\u6cd5\u3002 \u5b83\u7ecf\u5e38\u7528\u4e8e\u751f\u6001\u5b66\u548c\u751f\u7269\u5b66\u4e2d\uff0c\u4ee5\u91cf\u5316\u4e24\u4e2a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-2661","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97 Bray-Curtis \u76f8\u5f02\u6027 - Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97 Bray-Curtis \u76f8\u5f02\u6027\u3002\" \/>\n<meta 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